铝电解多功能天车是为电解生产服务的主要设备，它的正常运行是为确保生产任务圆满完成。多功能天车副钩升降原采用继电器控制直接起动，交流接触器正反转来实现副钩的升降起吊抬包出铝、更换阳极及吊运其他重物等作业。由于频繁起动、正反转切换，接触器触点常常被灼伤发生粘连，造成连电失控等安全隐患。自2003年软起动器技术应用以来，多功能天车副钩升降功能得到了较好的利用，消除了安全隐患，具有较高的改造价值，降低了维修费用。 

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一、原控制系统存在问题   多功能天车副钩电动机的额定功率为55KW，主要完成电解生产中的起吊工作，其起动方法采用继电器控制的直接起动，由交流接触器正反转来实现升降功能，存在如下问题：  1、由于机械承受全压起动的冲击转矩，对机械结构破坏性较大；  2、直接起动对电网的冲击较大； 3、起动电流大、起吊频繁，造成接触器粘连出现失控现象，存在较大安全隐患； 4、电机由于直接起动电流较大，接触器线圈易被烧坏，电机绝缘及电气性能损坏严重，大大地缩短了电机的使用寿命； 
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